The optical interferometry is opening us a new window on the central part of galaxies, particularly on the infernal engine at the heart of Active Galactic Nuclei. AMBER/VLTI provides the first opportunity to image the base of an extragalactic jet emerging from the inner part of a dust torus, making its way through hot ionized gas. In this paper, we illustrate the modeling developed for making full use of the first observations with AMBER.